bbad346add corrected a URL that broke several weeks ago. This problem
went unnoticed for a while partially because the workflow runs were all
still passing. A failure of a command in an &&-list is only considered
an error if it occurred in the last command of the list, even with `set
-e` being active (set automatically in GitHub actions).
From the Bash Reference Manual, 4.3.1 The Set Builtin:
> The shell does not exit if the command that fails is [...] part of any
> command executed in a && or || list except the command following the
> final && or ||.
Let's make download failures easier to disover by failing the workflow.
Every master-push getting marked with a red x-sign would probably have
been caught earlier.